Alternating-current arc lamp with inclosed arc



Jan. l, 1929.

l P. Qui-:isser: AL'rsnNAzx-m cunmam Anc mi? vwr'ru INcLosnn Anc FiledJan. 27, 1927 Patented Jan. l, 1929.

UNITED STATES PATENT OFFICE.

PAUL QUEISSER, OF BERLIFRIEDENAU, GERMANY, ASSIGNOR TO GEBRDER--SIE-MENS & CO., OF BERLIN-LICHTENBERG, GERMANY, A CORPORATION OF GERMANY.

ALTERNATING-CURRENT ARC LAMP WITH INCLOSED ARC.

lApplication fllerl January 27,1927, Serial No. 164,192, and in GermanyMarch 29, 1926.

My invention relates to an alternating current arc lamp with inclosedare.

In alternating current are lamps in which the arc is inelosed by anair-tight globe the arc is very sensitive to neighboring` current`carrying conductors, such as the system of live rods and bars supportingthe lower carbon, and may thus be deflected so as to crack the globe,and the tips of the solid or homogeneous flame aro carbons assume,furthermore, wedge shape in burning'down.

The object of my invention is to eliminate these disadvantages inherentin this tj-,fpe ot arc lamp. I attain this object by providing' aroundthe inclosed aro an annular body 0l iron, preferably a diametricallysplit iron ring` With substantial gaps, which compensates thedetrimental action ot the currentcarrying system of rods and bars uponthe are.

The effect which a split ring ot magnetic material, when located asdescribed and shown, has in such a lamp, resides in an absorption by thetworing halves ot the magnetic lield producer by the current flowing inthe supporting rods laterally of theare, so that the magnetic lieldcannot extend to the arc and blow it from its natural path.

In the drawings afliXed hereto an embodiment ot my invention isillust-rated by way Ot' example.

In these drawings:

Figure l, represents the lower portion of an alternating current arclamp in sectional elevation, embodying my improvement, and

Figure 2 represents a transverse section through that portion ot thelamp on line 2 2 in Figure l.

Referring to the drawings, l and 2 are the homogeneous flame are carbonsinclosed in an air-tight globe 6. The lower carbon l is supported by theCurrent-carrying system ot rods and bars Around the are el. is provideda body of iron 5 consisting ol ring halves separated by gaps. Thisnon-continuous ring is so arranged that the light ot' the lamps isobstructed as little as possible.

Various modilications and changes may be made without departing` fromthe spirit and t-he scope of the invention, and I desire7 therefore,that only such limitations shall be placed thereon as are imposed by theprior art.

I claim as my invention:

l. An alternating' current are lamp consisting substantially ot twooppositely disposed carbons, a current-carryingl system ot rods disposedin the vicinity of the are, and a ring ot' magnetic material open at twoopposite places surrounding the inclosed arc.

2. An alternating current are lamp consisting substantially ot twooppositely disposed hon'logeneous llame are carbons, a eurrent-cairyingIsystem oil rods disposed in the vicinity ot the arc,and a ring' offmagnetic mate-rial open at two opposite places and surrounding theinc-losed are.

3. In an alternating current are lamp, in combination, a lower carbon,a. system ot' current-carrying rods adapted to support said lowercarbon, an upper carbon, an airtight `Ve'lobe adapted to inelose saidcarbons, and a non-Continuous iron ring consist-ing olE halves separatedby gaps surrounding the pla-ce where the arc is formed.

In testimony whereof I affix my signature.

PAUL QUEISSEH.

